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Senior Notes - Additional Information (Detail)	May 07, 2015 USD ($)	Jul. 14, 2010 USD ($) Contract	May 07, 2008 USD ($) Contract
May 2008 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors			$ 275,000,000
Number of series of Senior Notes issued | Contract			4
Senior Notes issued in a private placement to a group of institutional investors, annual principal payment	$ 8,000,000
July 2010 Senior Notes
Debt Disclosure [Line Items]
Senior Notes issued in a private placement to a group of institutional investors		$ 245,000,000
Number of series of Senior Notes issued | Contract		4

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Name Accounting Standards Codification
-Topic 835
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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